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Designing and Engineering of Lost Circulation Materials for Different Lost Circulation Scenarios

Karimi Rad, Mohammad Saeed | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50501 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Goodarznia, Iraj; Tahmasebi, Korosh; kalhor, Mojtaba
  7. Abstract:
  8. Nowadays, one of the most major problems in drilling industry is Lost Circulation in different formations. Lost Circulation increases non-productive time, expenditures and environmental damages. Lost Circulation can happen in natural or induced fractures, cavernous formations and high permeable rocks and it can be subcategorized in seepage, medium, severe or complete type based on the severity of the problem. For addressing this issue, different methods are suggested. One of the most considered of these methods is using Lost Circulation Materials (LCM). In this thesis, it was tried to manage the situation with Designing and engineering of lost circulation materials for different lost circulation scenarios and finding the best choice to solve the specific problems. This design and optimization included improvements in width of fractures estimations, selecting best methods for particle size distribution of LCMs using experimental tests and choosing the appropriate type and shape of materials for seepage and medium mud loss events. Also different high strength plugs, using chemical components, for severe or complete losses was proposed. With performing different tests, for less than 500 micron fractures, resilient graphite material with optimum pore size distribution, for 500 to 2000 micron fractures, mixture of fiber and flaky materials and for severe and complete loss, diesel-bentonite pill, diesel-bentonite-polymer (natural gum) pill and sodium silicate pill were optimized and proposed
  9. Keywords:
  10. Drilling Fluid ; Experimental Studies ; Filtration Loss ; Loss Circulation Control ; Loss Circulation Materials (LCM) ; Fracture Width Estimation

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